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  <title>Interprets a string of XML into an object</title>
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 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.simplexml-load-string" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">simplexml_load_string</h1>
  <p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">simplexml_load_string</span> &mdash; <span class="dc-title">
   Interprets a string of XML into an object
  </span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.simplexml-load-string-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>simplexml_load_string</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$class_name</code><span class="initializer"> = &quot;SimpleXMLElement&quot;</span></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$options</code><span class="initializer"> = 0</span></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$ns</code><span class="initializer"> = &quot;&quot;</span></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$is_prefix</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
  ]]]] ) : <span class="type"><a href="class.simplexmlelement.html" class="type SimpleXMLElement">SimpleXMLElement</a></span></div>

  <p class="para rdfs-comment">
   Takes a well-formed XML string and returns it as an object.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.simplexml-load-string-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">data</code></dt>

     <dd>

      <p class="para">
       A well-formed XML string
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">class_name</code></dt>

     <dd>

      <p class="para">
       You may use this optional parameter so that
       <span class="function"><strong>simplexml_load_string()</strong></span> will return an object of 
       the specified class. That class should extend the 
       <span class="type"><a href="class.simplexmlelement.html" class="type SimpleXMLElement">SimpleXMLElement</a></span> class.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">options</code></dt>

     <dd>

      <p class="para">
       Since PHP 5.1.0 and Libxml 2.6.0, you may also use the
       <code class="parameter">options</code> parameter to specify <a href="libxml.constants.html" class="link">additional Libxml parameters</a>.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">ns</code></dt>

     <dd>

      <p class="para">
       Namespace prefix or URI.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">is_prefix</code></dt>

     <dd>

      <p class="para">
       <strong><code>TRUE</code></strong> if <code class="parameter">ns</code> is a prefix, <strong><code>FALSE</code></strong> if it&#039;s a URI;
       defaults to <strong><code>FALSE</code></strong>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.simplexml-load-string-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns an <span class="type"><a href="language.types.object.html" class="type object">object</a></span> of class <span class="type"><a href="class.simplexmlelement.html" class="type SimpleXMLElement">SimpleXMLElement</a></span> with
   properties containing the data held within the xml document, 或者在失败时返回 <strong><code>FALSE</code></strong>.
  </p>
  <div class="warning"><strong class="warning">Warning</strong><p class="simpara">此函数可能返回布尔值
<strong><code>FALSE</code></strong>，但也可能返回等同于 <strong><code>FALSE</code></strong> 的非布尔值。请阅读 <a href="language.types.boolean.html" class="link">布尔类型</a>章节以获取更多信息。应使用
<a href="language.operators.comparison.html" class="link">===
运算符</a>来测试此函数的返回值。</p></div>
 </div>


 <div class="refsect1 errors" id="refsect1-function.simplexml-load-string-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   Produces an <strong><code>E_WARNING</code></strong> error message for each error
   found in the XML data.
  </p>
  <div class="tip"><strong class="tip">Tip</strong>
   <p class="para">
    Use <span class="function"><a href="libxml_use_internal_errors.html" class="function">libxml_use_internal_errors()</a></span> to suppress all XML
    errors, and <span class="function"><a href="libxml_get_errors.html" class="function">libxml_get_errors()</a></span> to iterate over them
    afterwards.
   </p>
  </div>
 </div>


 <div class="refsect1 examples" id="refsect1-function.simplexml-load-string-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-6594">
    <p><strong>Example #1 Interpret an XML string</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$string&nbsp;</span><span style="color: #007700">=&nbsp;&lt;&lt;&lt;XML<br /></span><span style="color: #DD0000">&lt;?xml&nbsp;version='1.0'?&gt;&nbsp;<br />&lt;document&gt;<br />&nbsp;&lt;title&gt;Forty&nbsp;What?&lt;/title&gt;<br />&nbsp;&lt;from&gt;Joe&lt;/from&gt;<br />&nbsp;&lt;to&gt;Jane&lt;/to&gt;<br />&nbsp;&lt;body&gt;<br />&nbsp;&nbsp;I&nbsp;know&nbsp;that's&nbsp;the&nbsp;answer&nbsp;--&nbsp;but&nbsp;what's&nbsp;the&nbsp;question?<br />&nbsp;&lt;/body&gt;<br />&lt;/document&gt;<br /></span><span style="color: #007700">XML;<br /><br /></span><span style="color: #0000BB">$xml&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">simplexml_load_string</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$xml</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
SimpleXMLElement Object
(
  [title] =&gt; Forty What?
  [from] =&gt; Joe
  [to] =&gt; Jane
  [body] =&gt;
   I know that&#039;s the answer -- but what&#039;s the question?
)
</pre></div>
    </div>
    <div class="example-contents"><p>
     At this point, you can go about using <em>$xml-&gt;body</em>
     and such.
    </p></div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.simplexml-load-string-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="simplexml_load_file.html" class="function" rel="rdfs-seeAlso">simplexml_load_file()</a> - Interprets an XML file into an object</span></li>
    <li class="member"><span class="methodname"><a href="simplexmlelement.construct.html" class="methodname" rel="rdfs-seeAlso">SimpleXMLElement::__construct()</a> - Creates a new SimpleXMLElement object</span></li>
    <li class="member"><a href="simplexml.examples_errors.html" class="xref">Dealing with XML errors</a></li>
    <li class="member"><span class="function"><a href="libxml_use_internal_errors.html" class="function" rel="rdfs-seeAlso">libxml_use_internal_errors()</a> - Disable libxml errors and allow user to fetch error information as needed</span></li>
    <li class="member"><a href="simplexml.examples_basic.html" class="xref">Basic SimpleXML usage</a></li>
   </ul>
  </p>
 </div>

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